When I'm shooting lapses of waterfalls, the sea etc I usually use a 360 degree shutter to get some blurry motion to it. The same when shooting time lapse of people walking.

When shooting landscapes I sometimes shoot with a 45 degree shutter. Mostly because it rarely affects the image to much (depends on the clouds, though), and it allows me to use a f-stop around f/8 which makes the image sharper. The Sigma 8-16mm is not very sharp over f/11.

Usually, I set the interval at 1 sec and shoot in raw.

Exposure wise it depends on the subject, but I try to avoid zebras (burnt out areas), so if I know the light from the sun is coming in from behind the clouds, I underexpose by two or three stops. And if the sun doesn't appear after all, I can still pull the exposure back up again since the raw files can handle a lot of editing.

Ain't it possible to shoot 360° shutter (continuous shots) and then overlay a number of frames or stack a number of copies of the same clip? Stacking 24 frames of a 24 fps / 360° clip shouldn't be too different from exposing one second at a time. You even get more DR to work with, as you are essentiall shooting HDR.